Make sure the pics are sized within the specs
From page 55 of Touch manual...
Photo display limitations:
• Compatible file formats are as follows: .jpg, .gif, .png, .bmp
• Each file must be 1.5 MB or less.
• Recommended dimensions: 800 x 378
• Only the photograph(s) which meet these conditions will be
displayed. Photographs with extremely large dimensions (i.e., 2048
x 1536) may not be compatible and will appear as a blank (black)
image on the display.